Kicker 47KEY200.4ACOUSTIC CORRECTION = AUDIO PERFECTION Don't just make your system louder make it clearer. Make it better Press the selector, and the microphone goes to work. The KEY uses a powerful internal computer to deliver dramatic improvements in realism and soundstage. A massive 40 band equalizer improves tonality, and a 24dB crossover re defines the capabilities of each speaker. The concert quality of your factory stereo is revealed! What would take hours for